package com.sky.service.impl;

import com.sky.context.BaseContext;
import com.sky.dto.ShoppingCartDTO;
import com.sky.entity.Dish;
import com.sky.entity.Setmeal;
import com.sky.entity.ShoppingCart;
import com.sky.mapper.DishMapper;
import com.sky.mapper.SetmealMapper;
import com.sky.mapper.ShoppingCartMapper;
import com.sky.service.DishService;
import com.sky.service.ShoppingCartService;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import java.time.LocalDateTime;
import java.util.List;

@Service
@Slf4j
public class ShoppingCartServiceImpl implements ShoppingCartService {
    @Autowired
    private ShoppingCartMapper shoppingCartMapper;

    @Autowired
    private DishMapper dishMapper;

    @Autowired
    private SetmealMapper setmealMapper;

    @Override
    public void add(ShoppingCartDTO shoppingCartDTO) {
        log.info("添加购物车：{}",shoppingCartDTO);
        //判断当前加入到购物车中的商品是否已经存在了
        ShoppingCart shoppingCart = new ShoppingCart();
        BeanUtils.copyProperties(shoppingCartDTO,shoppingCart);
        shoppingCart.setUserId(BaseContext.getCurrentId());
        List<ShoppingCart> list = shoppingCartMapper.list(shoppingCart);

        //如果已经存在了，只需要将数量加一
        if(list!=null && list.size()>0){
            ShoppingCart cart = list.get(0);
            cart.setNumber(cart.getNumber()+1);
            shoppingCartMapper.updateNumberById(cart);
        }
        else{
            //如果不存在，需要插入一条购物车数据
            Long dishId = shoppingCartDTO.getDishId();
            if(dishId!=null){
                //本次添加到购物车的师菜品
                Dish dish = dishMapper.getById(dishId);
                shoppingCart.setName(dish.getName());
                shoppingCart.setImage(dish.getImage());
                shoppingCart.setAmount(dish.getPrice());
            }else{
                //本次添加到购物车的是套餐
                Long setmealId = shoppingCartDTO.getSetmealId();
                Setmeal setmeal = setmealMapper.getById(setmealId);
                shoppingCart.setName(setmeal.getName());
                shoppingCart.setImage(setmeal.getImage());
                shoppingCart.setAmount(setmeal.getPrice());
            }
            shoppingCart.setNumber(1);
            shoppingCart.setCreateTime(LocalDateTime.now());
            shoppingCartMapper.insert(shoppingCart);
        }


    }

    @Override
    public List<ShoppingCart> showshoppingCart() {
       Long userId = BaseContext.getCurrentId();
       ShoppingCart shoppingCart = ShoppingCart.builder()
               .userId(userId)
               .build();
       List<ShoppingCart> list = shoppingCartMapper.list(shoppingCart);
       return list;
    }

    @Override
    public void cleanShoppingCart() {
        Long userId = BaseContext.getCurrentId();
        shoppingCartMapper.deleteByUserId(userId);
    }

    @Override
    public void sub(ShoppingCartDTO shoppingCartDTO) {
        Long dishId = shoppingCartDTO.getDishId();
        //本次删除的是菜品
        if(dishId!=null){
            //从数据库中查询购物车全部信息
            ShoppingCart shoppingCart = new ShoppingCart();
            shoppingCart.setUserId(BaseContext.getCurrentId());
            shoppingCart.setDishId(dishId);
            List<ShoppingCart> list = shoppingCartMapper.list(shoppingCart);
            //如果菜品数量大于一，则数量减一
             if(list!=null && list.size()>0){
                 ShoppingCart cart = list.get(0);
                 if(cart.getNumber()>1){
                     cart.setNumber(cart.getNumber()-1);
                     shoppingCartMapper.updateNumberById(cart);
                 }else{
                     shoppingCartMapper.deleteByDishOrStemealId(cart);
                 }
             }
        }
        //
        else{
            //本次删除的是套餐
            //从数据库中查询购物车全部信息
            Long setmealId = shoppingCartDTO.getSetmealId();
            ShoppingCart shoppingCart = new ShoppingCart();
            shoppingCart.setUserId(BaseContext.getCurrentId());
            shoppingCart.setSetmealId(setmealId);
            List<ShoppingCart> list = shoppingCartMapper.list(shoppingCart);
            //如果套餐数量大于一，则数量减一，否则删除套餐
            if (list != null && list.size() > 0) {
                ShoppingCart cart = list.get(0);
                if(cart.getNumber()>1){
                    cart.setNumber(cart.getNumber()-1);
                    shoppingCartMapper.updateNumberById(cart);
                }else{
                    shoppingCartMapper.deleteByDishOrStemealId(cart);
                }
            }
        }
    }
}
